Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.
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Lee Je-hoon
Park Hae-young
Kim Hye-soo
Cha Soo-hyun
Cho Jin-woong
Lee Jae-han
16 eps
Season 1
2016
8 eps
The Second Signal
2026
Status
Ended
Original Language
KO
Network
tvN
Tagline
"There are those who are born monsters, but there are also those who are made into monsters by people."
Created By
Kim Eun-hee, Kim Won-suk
Production
AStory, Studio Dragon, BA Entertainment, Baram Pictures
Where to Watch
Stream
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